#要根据集合有的功能编写一个类
#自定义集合。模拟Python内置集合类型，实现元素添加、删除以及并集、交集、对称差集等基本运算。
```python
class Cuset:
def __init__(self,seq):
self._cuset = set(seq)
def add(self,elem):
self._cuset.add(elem)
def remove(self,elem):
self._cuset.remove(elem)
def __str__(self):
return "{0._cuset!s}".format(self)
def __repr__(self):
return "Cuset({0._cuset!r})".format(self)
def update(self,*others):#并集
for new in others:
self._cuset |= new._cuset
def intersection_update(self,*others):#合集
for new in others:
self._cuset &= new._cuset
def difference_update(self,*others):#差集
for new in others:
self._cuset -= new._cuset
def symmetric_difference_update(self,other):
self._cuset ^= other._cuset
def clear(self):
pass
def pop(self):
pass
a=Cuset([1,2,3,4,555,6,6,67])
b=Cuset(["a","b","c"])
d=Cuset([66,88,99,100,100,])
a.update(b,d)
print(a._cuset)
```